2G3G Neighboring Cell Automatic Optimization(GBSS 14.0_01)

2G/3G Neighboring Cell Automatic Optimization GBSS 14.0

Feature Parameter Description

Issue 01

Date 2012-04-28

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2012. All rights reserved.

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GSM BSS

2G/3G Neighboring Cell Automatic Optimization Contents

Issue 01 (2012-04-28) Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd

i

Contents

1 About This Document .............................................................................................................. 1-1

1.1 Scope ............................................................................................................................................ 1-1

1.2 Intended Audience......................................................................................................................... 1-1

1.3 Change History .............................................................................................................................. 1-1

2 Overview...................................................................................................................................... 2-1

3 Technical Description .............................................................................................................. 3-1

3.1 Network Topology .......................................................................................................................... 3-1

3.2 Task Creation ................................................................................................................................ 3-1

3.3 Neighboring Cell Analysis Algorithm ............................................................................................. 3-2

4 Parameters.................................................................................................................................. 4-1

5 Counters ...................................................................................................................................... 5-1

6 Glossary ...................................................................................................................................... 6-1

7 Reference Documents ............................................................................................................. 7-1

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 1 About This Document



1-1

1 About This Document

1.1 Scope

This document describes the GBFD-510901 2G/3G Neighboring Cell Automatic Optimization feature, including its technical description and benefits.

1.2 Intended Audience

This document is intended for:

Personnel who need to understand the 2G/3G Neighboring Cell Automatic Optimization feature.

Personnel who work with Huawei products

1.3 Change History

This section provides information on the changes in different document versions.

There are two types of changes, which are defined as follows:

Feature change: refers to a change in the 2G/3G Neighboring Cell Automatic Optimization feature of a specific product version.

Editorial change: refers to a change in wording or the addition of the information that was not described in the earlier version.

Document Issues

The document issue is as follows:

01 (2012-04-28)

Draft A (2012-02-15)

01 (2012-04-28)

This is the first release of GBSS14.0.

Compared with issue draft A (2012-02-15) of GBSS14.0, issue 01 (2012-04-28) of GBSS14.0 has no change.

Draft A (2012-02-15)

This is a draft.

Compared with issue 01 (2011-03-31) of GBSS13.0, draft A (2012-02-15) of GBSS14.0 is unchanged.

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 2 Overview



2-1

2 Overview

A 2G network must be compatible with a 3G network to support roaming and handovers between GSM and UMTS. Operators need to provide continuous and high-quality services in the boundary of different systems to avoid call drops by moving MSs.

Traditionally, inter-RAT neighboring cells are configured based on drive tests and analysis. This process is time consuming, labor intensive, and the test results are incomprehensive due to the limitations of drive tests. To improve efficiency and accuracy, a tool is required to automatically check the inter-RAT neighboring cell configuration based on data analysis.

Together with the Nastar network optimization tool, Huawei GSM BSS can analyze the 2G/3G neighboring cell configuration based on numerous measurement reports (MRs) from MSs, show the analysis results on a map, and find missing or redundant 3G neighboring cells for a GSM serving cell.

Configuring appropriate 3G neighboring cells based on the Nastar analysis results helps to improve the inter-RAT handover success rate and reduce the call drop rate, improving GSM network quality and user experience.

This document describes the 2G/3G Neighboring Cell Automatic Optimization feature from the following aspects:

Network topology

Task creation

Neighboring cell analysis algorithm.

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 3 Technical Description



3-1

3 Technical Description

3.1 Network Topology

This feature requires support from the BSC, M2000, Nastar, and MSs. To implement this feature, create a 2G/3G neighboring cell automatic optimization task on the Nastar. Figure 3-1 shows the network topology for this feature.

Figure 3-1 Network topology

NodeB

MS

BTS BSC

RNC Nastar

iManager M2000

3.2 Task Creation

The procedure for creating a 2G/3G neighboring cell automatic optimization task is as follows:

1. Create an end-to-end task on the Nastar and set the following basic information: task name, OSS name, NE name, NE type, measurement start time, measurement end time, measurement peirod, and scrambling code for the 3G neighboring cell to be measured.

When creating a neighboring 2G cell automatic measurement task, if a user does not specify a measurement step, the BSC automatically calculates the measurement step for a cell based on the length of the BA2 list configured for the cell. The user can run the BSC6900 MML command DSP NCS to query the measurement step calculated by the BSC.

2. The Nastar sends the task information to the M2000. The M2000 then sends the task information to the BSC through an MML command. After receiving this command, the BSC performs the measurement and generates results.

3. The BSC updates the BA2 once in each measurement period. The BSC adds UMTS cells (frequency and scrambling code) into the BA2 (the number of newly-added cells is the same as the measurement step), and then sends the updated BA2 to MSs through system information (SI). Then, MSs report the level of 3G neighboring cells through MRs.

4. The BSC collects MRs from MSs, and sends the data to the M2000.

5. The Nastar obtains the measurement files, configuration data, and counter values from the M2000, and then provides the optimization suggestions after analysis.

6. The 2G/3G neighboring cell analysis results are displayed in a map. Together with engineering parameters, the analysis results help network optimization engineers identify missing and redundant 2G/3G neighboring cells.

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 3 Technical Description



3-2

3.3 Neighboring Cell Analysis Algorithm

Neighboring cell analysis algorithms are used for determining missing or redundant cells.

In the algorithms, 3G neighboring cells are graded and sorted based on the absolute level, relative level, and number of MRs of the 2G serving cell and 3G neighboring cells. A greater score indicates a higher priority.

The algorithms for determining missing or redundant cells based on the priority are as follows:

Algorithm for determining a missing cell: If a cell is not configured as a neighboring cell but the priority of the cell is greater than the advised number of neighboring cells, the cell is considered a missing neighboring cell.

Algorithm for determining a redundant cell: If a cell is configured as a neighboring cell but the priority of the cell is smaller than the advised number of neighboring cells, the cell is considered a redundant neighboring cell.

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 4 Parameters



4-1

4 Parameters

There are no specific parameters associated with this feature.

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 5 Counters



5-1

5 Counters

Table 5-1 Counter description

Counter ID Counter Name Counter Description

Feature ID

1278272417 CELL.NCELL.LEV S360:Strength of Signals in Neighbor Cells

GBFD-510901

1278272418 CELL.NCELL.MR.NUM S361:MRs of Neighbor Cells

GBFD-510901

1278272419 CELL.NCELL.LEV.AVR AS360:Mean Strength of Signals in Neighbor Cells

GBFD-510901

1278272420 CELL.SCELL.LEV S362:Strength of Signals in Serving Cells

GBFD-510901

1278272421 CELL.SCELL.NCELL.LEV.LESS.THRES1.MR.NUM S363:Number of MRs in Which the Signal Strength Difference Between the Serving Cell and the Neighbor Cell Is Smaller Than the Neighbor Cell Interference Level Threshold 1

GBFD-510901

1278272422 CELL.SCELL.NCELL.LEV.GT.THRES1.MR.NUM S364:Number of MRs in Which the Signal Strength Difference Between the Serving Cell and the Neighbor Cell Is Greater Than the Neighbor Cell Interference Level Threshold 1

GBFD-510901


GBFD-510901

../RNCCounterHtml/mbsc/m-perf/Mt-3347.html







GSM BSS




5-2


Feature ID


GBFD-510901


GBFD-510901


GBFD-510901


GBFD-510901





GSM BSS




5-3


Feature ID


GBFD-510901

1278272429 CELL.SCELL.NCELL.DIFF.LEV.AVR AS362:Mean Signal Strength Difference Between Serving Cell and Neighbor Cell

GBFD-510901

1278272430 CELL.NCELL.SCELL.LEV.GT.RTHRES.MR.NUM S371:Measurement Reports with Signal Strength Difference Between Neighbor Cell and Serving Cell Greater Than Relative Level Threshold

GBFD-510901

1278272431 CELL.NCELL.LEV.GT.ABS.THRES.MR.NUM S372:Measurement Reports with Signal Strength of Neighbor Cell Greater Than Absolute Level Threshold

GBFD-510901

1278272445 CELL.NCELL.LEVEL.0 S386:Number of MRs on Competitive Cell (Receive Level Rank 0)

GBFD-510901


GBFD-510901


GBFD-510901


GBFD-510901









GSM BSS




5-4


Feature ID


GBFD-510901


GBFD-510901


GBFD-510901


GBFD-510901

1278272453 CELL.SCELL.NCELL.LEV.LESS.THRES0.MR.NUM S394:Number of MRs in Which the Signal Strength Difference Between the Serving Cell and the Neighbor Cell Is Smaller Than the Neighbor Cell Interference Level Threshold 0

GBFD-510901

1282432826 CELL.UCELL.INTERRAN.OUTCELL.HO.REQ ST512:Number of GSM-WCDMA Outgoing Inter-RAT Inter-Cell Handover Requests

GBFD-510901

1282432827 CELL.UCELL.INTERRAN.OUTCELL.HO.FAIL ST513:Number of Failed GSM-WCDMA Outgoing Inter-RAT Inter-Cell Handovers

GBFD-510901








GSM BSS

2G/3G Neighboring Cell Automatic Optimization 6 Glossary



6-1

6 Glossary

For the acronyms, abbreviations, terms, and definitions, see the Glossary.

Glossary.htm

GSM BSS

2G/3G Neighboring Cell Automatic Optimization 7 Reference Documents



7-1

7 Reference Documents

[1] BSC6900 Feature List

[2] BSC6900 Basic Feature Description

[3] BSC6900 GSM Parameter Reference

[4] BSC6900 GSM MML Command Reference

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